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Commits on Dec 11, 2013
  1. first draft

    evanmcc committed Dec 11, 2013
Commits on Dec 2, 2013
Commits on Nov 27, 2013
Commits on Nov 26, 2013
  1. Work-around model limitation/bug in PULSE test, bitcask_eqc.erl

    slfritchie committed Nov 26, 2013
    In the C65 counterexample below, the {var,2} worker proc tries to
    get key #19 and allegedly fails.  The last step of the main proc is
    a put loop of keys #1 - #34.  The {var,2} worker is racing with
    both the main proc and also with the {var,7} worker that is
    doing a fold.  The fold happens first, which freezes the keydir
    when the next put happens.  Then the {var,2} worker does its get
    and finds (correctly) `not_found` ... but the model is buggy and
    can't predict the correct answer.
    
    I'm not good enough at the temporal logic to fix the model
    The Correct Way.  So I've patched it up so that any 'bad' thing
    detected by the main/1st proc is truly bad.  But if a 'bad' thing
    happens in a forked worker, then if we know that there's a fold
    happening at the same time, we assume that the model's predicted
    answer is bad and thus we *ignore* the 'bad' thing.
    
        191> C65 = binary_to_term(element(2,file:read_file("zzz.c65@develop@commit=a2d75.bin"))).
        [[{set,{var,2},
               {call,bitcask_eqc,fork,
                     [[{init,{state,undefined,false,false,[]}},
                       {set,{not_var,8},{not_call,bitcask_eqc,bc_open,[false]}}]]}},
          {set,{var,4},
               {call,bitcask_eqc,fork,
                     [[{init,{state,undefined,false,false,[]}},
                       {set,{not_var,2},{not_call,bitcask_eqc,bc_open,[false]}},
                       {set,{not_var,3},
                            {not_call,bitcask_eqc,bc_close,[{not_var,2}]}},
                       {set,{not_var,9},{not_call,bitcask_eqc,bc_open,[false]}},
                       {set,{not_var,10},
                            {not_call,bitcask_eqc,get,[{not_var,9},19]}}]]}},
          {set,{var,6},
               {call,bitcask_eqc,fork,
                     [[{init,{state,undefined,false,false,[]}},
                       {set,{not_var,3},{not_call,bitcask_eqc,bc_open,[false]}}]]}},
          {set,{var,7},
               {call,bitcask_eqc,fork,
                     [[{init,{state,undefined,false,false,[]}},
                       {set,{not_var,5},{not_call,bitcask_eqc,bc_open,[false]}},
                       {set,{not_var,7},
                            {not_call,bitcask_eqc,fold,[{not_var,5}]}}]]}},
          {set,{var,12},
               {call,bitcask_eqc,fork,
                     [[{init,{state,undefined,false,false,[]}},
                       {set,{not_var,3},{not_call,bitcask_eqc,bc_open,[false]}},
                       {set,{not_var,8},
                            {not_call,bitcask_eqc,fold,[{not_var,3}]}}]]}},
          {set,{var,17},{call,bitcask_eqc,bc_open,[true]}},
          {set,{var,28},{call,bitcask_eqc,put,[{var,17},1,<<>>]}},
          {set,{var,29},{call,bitcask_eqc,needs_merge,[{var,17}]}},
          {set,{var,30},{call,bitcask_eqc,fork_merge,[{var,17}]}},
          {set,{var,32},
               {call,bitcask_eqc,puts,[{var,17},{1,34},<<>>]}}],
         {77863,46676,48146},
         [{events,[]}]]
Commits on Nov 25, 2013
  1. Fix model problem in bitcask_qc_expiry.erl

    slfritchie committed Nov 25, 2013
    Here's a failing test case:
    
        [{[{delete,<<1>>,<<>>},{put,<<0>>,<<>>}],10,1,5,5}]
    
    ... and the result:
    
                          {expected,false},
                          {value,
                              {true, [blah blah...]
    
    It's just too damn difficult to model needs_merge() when there's
    so little data written.  So, we use the ?IMPLIES to check that
    there are more than 2 'put' operations.
  2. Tentative fix for PULSE model: kill vs. stuck merge lock

    slfritchie committed Nov 25, 2013
    If the EQC PULSE model kills a subprocess that is in the middle
    of opening the bitcask and has obtained the merge lock but not
    yet released it when it is killed, then subsequent attempts to
    open the cask will fail because the merge lock cannot be detected
    as stale.
    
    Failing test case:
    
        [[{set,{var,5},{call,bitcask_eqc,bc_open,[true]}},
          {set,{var,8},
               {call,bitcask_eqc,fork,
                     [[{init,{state,undefined,false,false,[]}},
                       {set,{not_var,2},{not_call,bitcask_eqc,bc_open,[false]}},
                       {set,{not_var,3},
                            {not_call,bitcask_eqc,fold,[{not_var,2}]}}]]}},
          {set,{var,15},{call,bitcask_eqc,fork_merge,[{var,5}]}},
          {set,{var,17},{call,bitcask_eqc,kill,[{var,8}]}},
          {set,{var,19},{call,bitcask_eqc,bc_close,[{var,5}]}},
          {set,{var,22},{call,bitcask_eqc,bc_open,[true]}}],
         {22143,93849,96204}]
    
    Failing execution:
    
            [{11419,{call,<0.27681.87>,{open,true}}},
             {21034,{result,<0.27681.87>,#Ref<0.0.359.29314>}},
             {21076,{call,<0.27681.87>,fork}},
             {21095,{result,<0.27681.87>,<0.27834.87>}},
             {21204,{call,<0.27681.87>,{fork_merge,#Ref<0.0.359.29314>}}},
             {21396,{call,<0.27834.87>,{open,false}}},
             {21619,{result,<0.27681.87>,not_needed}},
             {21650,{call,<0.27681.87>,{kill,<0.27834.87>}}},
             {21682,{result,<0.27681.87>,true}},
             {21700,{call,<0.27681.87>,{close,#Ref<0.0.359.29314>}}},
             {21743,{result,<0.27681.87>,ok}},
             {21768,{call,<0.27681.87>,{open,true}}},
    
    This patch introduces a hack that is only used during the bitcask_eqc
    test, via a "magic" shared process dictionary key.  If that key
    exists, then if a `poll_for_merge_lock()` attempt fails due to a stale
    lock, we will allow the operation to pseudo-succeed and permit the
    test case to continue.
  3. Pass read-write mode to keydir_get_int: permit read-write mode to alw…

    slfritchie committed Nov 22, 2013
    …ays see latest mutations
    
    Work around problems like this:
    
        1> C30 = binary_to_term(element(2,file:read_file("zzz.c30@develop@commit=dacf8f0630.bin"))).
        [[{set,{var,3},
               {call,bitcask_eqc,fork,
                     [[{init,{state,undefined,false,false,[]}},
                       {set,{not_var,2},{not_call,bitcask_eqc,bc_open,[false]}},
                       {set,{not_var,7},
                            {not_call,bitcask_eqc,fold,[{not_var,2}]}}]]}},
          {set,{var,6},{call,bitcask_eqc,bc_open,[true]}},
          {set,{var,7},{call,bitcask_eqc,put,[{var,6},1,<<>>]}},
          {set,{var,10},{call,bitcask_eqc,get,[{var,6},1]}}],
         {90598,47026,49786},
         [{events,[]}]]
    
    This looks like a very simple test case.  It is.  Here's an interleaved
    execution that shows a model failure.
    
        2> eqc:check(eqc:testing_time(15*60, bitcask_eqc:prop_pulse(local,false)), C30).
        Starting Quviq QuickCheck version 1.30.2
           (compiled at {{2013,11,18},{14,34,14}})
        Licence for Basho reserved until {{2013,11,23},{10,19,48}}
        Failed!
        [{set,{var,3},
              {call,bitcask_eqc,fork,
                    [[{init,{state,undefined,false,false,[]}},
                      {set,{not_var,2},{not_call,bitcask_eqc,bc_open,[false]}},
                      {set,{not_var,7},{not_call,bitcask_eqc,fold,[{not_var,2}]}}]]}},
         {set,{var,6},{call,bitcask_eqc,bc_open,[true]}},
         {set,{var,7},{call,bitcask_eqc,put,[{var,6},1,<<>>]}},
         {set,{var,10},{call,bitcask_eqc,get,[{var,6},1]}}]
        {90598,47026,49786}
    
        State: {state,#Ref<0.0.0.520>,true,false,[<0.169.0>]}
        events: failed
        Events:
        [{0,23208,[]},
         {23208,23209,[{call,<0.161.0>,fork}]},
         {23209,23225,[]},
         {23225,23226,[{result,<0.161.0>,<0.169.0>}]},
         {23226,23351,[]},
         {23351,23352,[{call,<0.161.0>,{open,true}}]},
         {23352,28804,[]},
         {28804,28805,[{call,<0.169.0>,{open,false}}]},
         {28805,41666,[]},
         {41666,41667,[{result,<0.161.0>,#Ref<0.0.0.520>}]},
         {41667,41694,[]},
         {41694,41695,[{call,<0.161.0>,{put,#Ref<0.0.0.520>,1,<<>>}}]},
         {41695,48172,[]},
         {48172,48173,[{result,<0.169.0>,#Ref<0.0.0.545>}]},
         {48173,48209,[]},
         {48209,48210,[{call,<0.169.0>,{fold,#Ref<0.0.0.545>}}]},
         {48210,48413,[]},
         {48413,48414,[{result,<0.161.0>,ok}]},
         {48414,48445,[]},
         {48445,48446,[{call,<0.161.0>,{get,#Ref<0.0.0.520>,1}}]},
         {48446,48453,[]},
         {48453,48454,[{result,<0.161.0>,not_found}]},
         {48454,49098,[]},
         {49098,49099,[{result,<0.169.0>,[]}]},
         {49099,49123,[]},
         {49123,49124,[{call,<0.169.0>,{close,#Ref<0.0.0.545>}}]},
         {49124,49155,[]},
         {49155,49156,[{result,<0.169.0>,ok}]},
         {49156,infinity,[]}]
        Bad:
        [{0,48453,[]},{48453,infinity,[{bad,{get,1,[<<>>],not_found}}]}]
        false
    
    At time 48453, we got a `get` result where we expected to find
    a `<<>>` but instead got a `not_found`.  The `fold` operation is
    interleaved at just the proper timing to trigger a keydir freezing,
    which causes an unexpected result.
    
    The patches in this commit add a read/write flag to the `keydir_get_int`
    NIF function.  If the `keydir_get_int` being performed is by the one
    process that has the bitcask open for read/write mode, then we should
    ignore all snapshots and be able to get the latest-and-greatest mutation
    of the keydir.  The diff is enlarged/cluttered by small patches to fix
    up other test cases: to add the appropriate new argument where needed.
Commits on Nov 22, 2013
Commits on Nov 21, 2013
Commits on Nov 20, 2013
  1. - retry create lock acquistion with delay

    evanmcc committed Nov 19, 2013
    - remove double close in merge fold
Commits on Nov 19, 2013
  1. rework merge worker to do use an ad-hoc bounded queue rather than

    evanmcc committed Nov 19, 2013
    erlang's default queue implementation.
    
    also hibernate the process when a queue item is removed to expedite
    GCing and resizing the heap.
  2. Merge pull request #119 from Licenser/patch-1

    evanmcc committed Nov 19, 2013
    added erlang file header.
Commits on Nov 18, 2013
  1. alter some specs to get dialyzer cleaner, but leave one in as it is

    evanmcc committed Nov 18, 2013
    a) not needed, and b) changes code.
Commits on Nov 14, 2013
  1. added erlang file header.

    Licenser committed Nov 14, 2013
    Added the Erlang header line so the filetype can be detected
Commits on Nov 7, 2013
  1. Merge branch 'develop' into refactor/pevm-avoid-file-server

    evanmcc committed Nov 7, 2013
    doing this to bring the branch up to date and fix a known merge
    issue w/ PR #115
  2. Merge pull request #116 from basho/bugfix/pevm-fix-resource-leak

    evanmcc committed Nov 7, 2013
    Fix fstat struct leak.
  3. - add stats return for non-existent fstats entries

    evanmcc committed Nov 7, 2013
    - log when non-existent fstats entries are trimmed
    - dedup the fstats list so the above logging isn't constantly
      triggered.
  4. Merge pull request #115 from basho/refactor/pevm-lazy-mergefile-create

    evanmcc committed Nov 7, 2013
    lazily create merge files to avoid creation of empty files
Commits on Nov 6, 2013
  1. some cleanup

    evanmcc committed Nov 6, 2013
Commits on Nov 5, 2013
  1. - remove decrement (just never reuse filename on error).

    evanmcc committed Nov 5, 2013
    - make it so that folds no longer use filelib.
    - remove the use of file_name since it's expensive and unneeded.
Commits on Oct 30, 2013
Commits on Oct 28, 2013
  1. add keydir_trim_fstats to bitcask_nifs, allowing the post merge live

    evanmcc committed Oct 28, 2013
    files update to remove entries for deleted files so they are no longer
    considered for merge or for status
Commits on Oct 25, 2013
Commits on Oct 23, 2013
  1. initial version

    evanmcc committed Oct 23, 2013
Commits on Oct 15, 2013
  1. Merge pull request #112 from basho/jd-cuttlefish

    joedevivo committed Oct 15, 2013
    moved in bitcask schema bits from riak.schema
  2. reworded comment for require_crc_hint in schema

    Joe DeVivo
    Joe DeVivo committed Oct 15, 2013
Commits on Oct 9, 2013
  1. moved in bitcask schema bits from riak.schema

    Joe DeVivo
    Joe DeVivo committed Oct 9, 2013
Commits on Sep 23, 2013
  1. Merge pull request #110 from basho/pevm-remove-stdbool

    evanmcc committed Sep 23, 2013
    remove unused header